patch 9.1.0563: Cannot process any Key event

Problem:  Cannot process any Key event
Solution: Add the KeyInputPre autocmd
          (Shougo Matsushita)

closes: #15182

Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Co-authored-by: K.Takata <kentkt@csc.jp>
Signed-off-by: Shougo Matsushita <Shougo.Matsu@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/vim.h b/src/vim.h
index ae7458a..a359162 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1397,6 +1397,7 @@
     EVENT_INSERTENTER,		// when entering Insert mode
     EVENT_INSERTLEAVEPRE,	// just before leaving Insert mode
     EVENT_INSERTLEAVE,		// just after leaving Insert mode
+    EVENT_KEYINPUTPRE,		// before key input
     EVENT_MENUPOPUP,		// just before popup menu is displayed
     EVENT_MODECHANGED,		// after changing the mode
     EVENT_OPTIONSET,		// option was set